Neco 2024 Chemistry Question 11

An unknown inorganic salt is dissolved in distilled water to give a clear solution. The following observations are recorded: 1. Flame test of the solid gives a brick‑red colour. 2. Adding a few drops of dilute \( \text{HCl} \) to the solution produces no precipitate. 3. Adding \( \text{AgNO}_3 \) to the solution yields a white precipitate that dissolves in dilute \( \text{NH}_3 \) solution. 4. Adding \( \text{BaCl}_2 \) to a separate portion of the same solution produces a white precipitate which dissolves on addition of dilute \( \text{HCl} \). Based on these observations, identify the cation and the anion present in the salt, and write the formula of the salt.